Filter.



PATENTED SEPT. 19, 1965.- J. w. HILL.

FILTER.

APPLIOAITION 211.21) mm. 13,1905.

A UNITED OFFICE. 9 JOHN PHILADELPHIA. PEuNsYLVANIA.

I FILTER."

b No. 800,108.

Specification of Letters Patent.

Patented Sept. 19, 1905.

Kpplication filed February 13, 190fi. Serial No- 245,457.

To all whom it may concern." v Be it known that I, JOHN HILL, a-citizen of the United States, residing -i n Philadelphia, Pennsylvania, have invented certain Improvements in- Filters, of which the following is a specification. I r

The object of myin-vention is to so design a system of filters that the filtering-chambers can be cleaned without interfering with the continuous flow of water throughthe system.

My invention is particularly adapted to preliminary or roughing filters intended to prepare very turbid water for final treatment in plain sand filters by removing at a compara- 4 a of concrete or any other suitable material,

tively high rate of speed of filtration the large percentage of'sus-pe'ndedmatter.

In the accompanying drawings, Figure 1 is a plan view illustrating aseries of three filtering-chambers and illustrating my invention. Fig. 2 is a transverse sectional view on the line 2 2, Fig. 1. I

AA A are three chambers formed by walls and these chambers are separatedby partitions or a. I preferably arrange the system so that three chambers will comprise each series or group, and thus one chamber will always be out of service and empty of filtering-sand and the other chambers will be filled with sand and in service, the empty chamber being ready to receive sand from a clogged chamber after it has been washed and prepared for further use. p

In the present instance each filtering-chamber is arranged as described and claimed in my application for patent filed November 8, 1904, Serial No. 231,919, and as shown in Fig. 2.

Extending longitudinally under the center of each chamber is a main collector b for filtered water, coupled to the pipe B, which carries the filtered water to the final filters or to a storage-reservoir, and on the floor of each chamber is a supporting-body of. gravel or other coarse material, and above this material is a body of sand or any other suitable filtering medium. Between the body of sand and the supporting-bed of gravel are inlet-pipes C, having perforated branches 0, through which the wash-water is introduced to clean the body of filtering material; The pipes C 4 The water to be filtered is admitted to'each chamber above the body'of filtering material through pipes E in any suitable. manner.

The above description refers to a filter in which my invention may be carried into effect.

I'lay no claim to the filter in this application, as. it is fully claimedin the application referred to above.

F is a sand-washerof any type desired, conter-supply pipe-G by means of a branch pipe g, so that when the sand to' be washed and cleaned is fed into thehopper by; hand or'by mechanicalmeans the water under pressure y from the pipe g forces the sand through: the c'onveyer-pipe-I into the sand-washerF. The sand :is scoured and partly washed as it passes with the water. through the pipe I- to the'sandwasher..-

The conveying-pipes I and the water-supply pipes g are preferably flexible, so that the ejector hopper 1 can be moved over the filtering-bed and can be taken bodily from the chamber and set up inanother chamber from which the sand is to be removed.

Extending from the sand-washer F is a distributing-pipe f for the washed sand, and on the end of this pipe is a flexible section f so that theoperator can distribute the sand evenly over the bed of the chamber into which the sand is introduced.

In the drawings the chamber A is in operation as a filter. Water introduced through the pipe E passes through the body of filtering material and the supporting-bed into the effluent passage and to the pipe B. The chamber A has been emptied of filtering material, the sand from this chamber having been passed through the washer F and discharged into the chamber A, and the .chamber is now being supplied with washed sand received from the washerF and supplied to the washer from the chamber A which is being emptied of sand by shoveling the sand into the ejector hopper z'. When the chamber A is charged,water to be filtered is turned on, while the chamber A is idle and being thoroughly cleaned. Thus the several chambers can be operated and cleaned in rotation without interfering with the flow of filtered water.

It will be understood that the filtering material in each chamber is agitated and the loose particles of foreign matter removed by admitting wash-water through the pipes C C, and it is only when the foreign matter adheres to the particles of sand and cannot be removed by the wash-water that the sand is taken out of the chamber and passed through the washer and scrubber.

While I have shown a particular form of filter in describing my invention, it will be understood that it can be carried out in any sand or granular filter of the general type Without departing from the main feature of my invention.

I claim as my invention 1. The combination in a filter, of three filtering-chambers, each chamber having an inlet for unfiltered water, an outlet for filtered water, and a bed of granular material for supporting the filtering material, a wash-water inlet and a wash-water outlet for each filtering-chamber,washing apparatus for the granular filtering material, said apparatus having supply and discharge pipes adapted to communicate with any of the chambers, the parts being so arranged that while one chamber is used for filtering, the filtering material can be removed from one of the other chambers, passed through the washer and discharged directly into the third chamber with a certain proportion of water, the Wash-water outlet being placed to receive the surplus water flowing from the chamber, substantially as described.

2. The combination in a filter, of three or more filtering-chambers, each chamber having an inlet and an outlet for filtered water and having a bed of granular material acting as a support for the filtering material, and a wash-water outlet above the bed of filtering material, washing apparatus for the granular filtering material having a supply-pipe arranged to communicate with any one of the filtering-chambers, an ejector-hopper communicating With the supply-pipe and arranged to receive the filtering material from the chamber with which the supply-pipe is connected, a discharge-pipe for the mixture of wash sand and water, said pipe having a flexible portion and so arranged that the mixture of sand and water can be discharged directly into a filtering-chamber, the excess water escaping from the chamber through the wash-water outlet whereby the filtering material can be evenly distributed over the surface of the granular supporting material, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN W. HILL.

Witnesses:

SAMUEL J. FIsHER, JAMEs F. MOCRUDDEN. 

